* Astronomy

Orbital elements:
2013 GB55                                                Earth MOID = 0.0252 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M   2.07135              (2000.0)            P               Q
n   0.33597741     Peri.  179.01153     -0.92865067     +0.36593772
a   2.0492550      Node    22.75020     -0.34141486     -0.77903538
e   0.4984521      Incl.    9.04677     -0.14506490     -0.50911047
P   2.93           H   25.8           G   0.15           U   7

MPEC 2013 - G49

Key to Orbital elements

The 19 - 42 metre wide asteroid 2013 GB55 will make a close pass (9.8 lunar distances, 0.0252 AU), travelling at 8.11 km/second, to the Earth-Moon system on the 12th April, 2013 @ 20:12 UT ±00:15. 

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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).